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habanalabs: debugfs support for larger I2C transactions

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I2C debugfs support is limited to 1 byte. We extend functionality
to more than 1 byte by using one of the pad fields as a length.
No backward compatibility issues as new F/W versions will treat 0
length as a 1 byte length transaction.

Signed-off-by: Ofir Bitton <obitton@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
This commit is contained in:
Ofir Bitton
2021-10-12 20:52:46 +03:00
committed by Oded Gabbay
parent e617f5f4c1
commit 3eb7754ff4
4 changed files with 50 additions and 18 deletions
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Documentation/ABI/testing/debugfs-driver-habanalabs
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@@ -155,6 +155,13 @@ Description: Triggers an I2C transaction that is generated by the device's
CPU. Writing to this file generates a write transaction while
reading from the file generates a read transaction
What: /sys/kernel/debug/habanalabs/hl<n>/i2c_len
Date: Dec 2021
KernelVersion: 5.17
Contact: obitton@habana.ai
Description: Sets I2C length in bytes for I2C transaction that is generated by
the device's CPU
What: /sys/kernel/debug/habanalabs/hl<n>/i2c_reg
Date: Jan 2019
KernelVersion: 5.1